CHROMATE TREATED GALVANIZED STEEL SHEET EXCELLENT IN CORROSION RESISTANCE AND ITS PRODUCTION

PROBLEM TO BE SOLVED: To improve the corrosion resistance of a chromate treated galvanized steel sheet. SOLUTION: As to this galvanized steel sheet, a chromate film contains a chromium phosphate compd., and the compd. has a concn. gradient in the film thickness direction concentrated in the vicinity...

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Bibliographische Detailangaben
Hauptverfasser:	YOSHITAKE MAKOTO, FURUKAWA SHINYA, KITAMURA KAZUMI
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL CORRECTING FLUIDS DIFFUSION TREATMENT OF METALLIC MATERIAL DYES FILLING PASTES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To improve the corrosion resistance of a chromate treated galvanized steel sheet. SOLUTION: As to this galvanized steel sheet, a chromate film contains a chromium phosphate compd., and the compd. has a concn. gradient in the film thickness direction concentrated in the vicinity of the boundary with the plating layer. The chromium phosphate compd. concentrated and distributed in the vicinity of the boundary with the plating layer functions as a barrier layer checking the intrusion of corrosion factors (H2O, Cl, O2-, or the like) into base steel and strengthens its corrosion resistance. The chromate film is formed by coating the surface of the plating layer with a soln. of ammonium chromate contg. phosphoric acid of 1.8±0.2% concn., heating it to the temp. range of 100 to 160 deg.C at the temp. rising rate of 5 to 25 deg.C/sec to increase its temp. and holding it to the temp. range for 20 to 40 sec.